Add getSupportedTypes method for (de)normalizerInterface implementations

src/Bundle/ChillMainBundle/Serializer/Normalizer/UserNormalizer.php

@@ -122,4 +122,15 @@ class UserNormalizer implements \Symfony\Component\Serializer\Normalizer\Normali
 
         return false;
     }
+
+    public function getSupportedTypes(?string $format): array
+    {
+        if ('json' === $format || 'docgen' === $format) {
+            return [
+                User::class => true,
+            ];
+        }
+
+        return [];
+    }
 }